单项选择题
A.两边 B.后边 C.左边
A.侧边,中线,横排 B.中线,横排,侧边 C.横排,侧边,中线 D.中线,侧边,横排
A.420,300 B.420,150 C.300,150 D.900,300
A.420,300 B.420,150 C.300,150
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